DC motors Sizes 160 to 630 31.5 kW to 1610 kW - Siemens

Explanations© Siemens AG 20082Noise levelsThe noise levels of the motors have been determined accordingto ISO 1680/ISO 3744 and lie far below the values permitted accordingto EN 60 034-9. This has been achieved thanks to themechanical design and by optimizing the magnetic circuit andthe ventilation.The sound pressure level L pA and the acoustic power level L WA(acc. to the table below, including tolerance) are applicable atfull load up to 2000 rpm, for converter infeed in B6C connectionand with a standard external fan at 50 Hz.The acoustic power level L WA is the sum of measuring surfacesize and the measuring surface sound pressure level L pA .For comparisons with the standard, a no-load/load differential ofthe machine noise of 3 to 5 dB can be assumed. The no-loadnoise values for an infeed of pure DC current lie about 3 dBbelow the noise values for converter infeed.When a filter is installed, the noise values are reduced by1 to 2 dB.When a silencer is used (see "Selection and ordering" - "Options"),the noise values are reduced by approx. 5 dB.Frame size Measuring surface Acoustic power levelsound pressure levelL pAL WAdB (A)dB (A)1GG6 and 1GH6 motors160 73 861G.6/ and 1H.6 motors1GH61HS61GG61HQ61GH61HS61GG61HQ6180 72 76 85 90200 73 77 87 91225 76 80 90 94250 78 82 93 97280 80 84 95 99Noise values are available for larger motors on request.BearingsMotors up to and including Size 200 have roller bearings(grooved ball bearings) with permanent lubrication. Larger motorsare provided with a regreasing device. In the case of increasedlateral forces, a special version of the drive-end bearingis required (see "Selection and ordering" - "Options" and theproject engineering manual).In all motors, the fixed bearings are at the non-drive end.For positioning angles up to the vertical, the bearings of the motorsup to Size 280 can carry the weight of the rotor as well asone half of the coupling. In the case of additional axial loads,please inquire.Cooling and ventilationCooling:The cooling air is normally fed from the non-drive end (NDE) tothe drive end (DE), i.e. from the commutator end to the outputend, where it discharges through vents to the left and right. Thisdirection of air flow is necessary to achieve adequate cooling forthe commutator for motors operating at high speeds and outputs.The direction of air flow can be reversed (from the drive end tothe non-drive end; i.e. from the output end to the commutatorend). This is recommended for motors operated with weakloads, low cooling-air intake temperature, or under harsh ambientconditions (aggressive gases, organic liquids, dust, etc.)Derating may be necessary under some circumstances (onrequest).The fan unit of the 1GG motors can also be retrofitted to 1GHmotors.Frame size Cooling air Permissible pressureflow drop in the ductsfor 1GG motorsV·Δpm 3 /s Pa Pa1GG6, 1GH6160 0.20 60 1300180 0.30 70 1350200 0.35 70 1250225 0.50 80 1600250 0.60 80 1500280 0.75 80 16001GG7, 1GH7351 1.3 100 1800352 1900353 2000354 2300355 2500401 1.6 100 1800402 1900403 2100404 2200405 2500451 2.0 100 1700452 1800453 2000454 2200455 24001GG5, 1GH5500 2.0 70 1400630 3.0 70 1350Requiredpressurefor 1GH motorsΔp2/4Siemens DA 12 · 2008